Experience peak performance and versatility with the SRAM RED E1 XG-1290 12-Speed Cassette. SRAM s most advanced and durable cassette offers a wide range of gears and precision shifting that meets the demands of any route. Choose from innovative options like the first-ever 10-30T and 10-36T RED cassettes, designed to keep you in control, whether it's racing or exploring new roads.Key Features and Benefits:Smooth and Fast Shifting: Enjoy immediate gear changes with less effort. This results in a more efficient and enjoyable ride, especially in competitive settings.Gradual Gear Progression: At least five one-tooth jumps ensure small gear increments, providing optimal speed and torque control across varying terrains.10-tooth Start: Starts at 10 teeth, offering a broader range of gears. This helps in conquering steep climbs and accelerating on flats with ease.10-30T and 10-36T Options: Now available in RED versions for enhanced versatility. This choice allows for customization according to